Spectacle lens for a display device that can be placed on the head of a user and generates an image, display device with such a spectacle lens and method for producing such a spectacle lens

Abstract

A spectacle lens is provided for a display device (1) which can be placed on the head of a user and generates an image, wherein the spectacle lens (3) has a light guide channel (21) which guides light beams (L1) of the generated image, which are coupled into the spectacle lens (3), in the spectacle lens (3) through at least one reflection to a deflection section (18), from which they are deflected to exit the spectacle lens (3) via the back of the spectacle lens (3), wherein the light guide channel (21) has a base body (13) and a first channel boundary layer (16), wherein the first channel boundary layer (16) is applied directly to the first boundary surface (14) of the base body (13) and is made of a second material having a second refractive index (n 2 ) is formed, where the second refractive index (n 2 ) is smaller than a first refractive index (n 1) of the material of the base body (13), so that reflections of the light beams (L1) at the boundary between the first channel boundary layer (16) and the first boundary surface (14) are total reflections, and wherein the first channel boundary layer (16) is formed as a colored layer.

Description

[0001] The present invention relates to a spectacle lens having the features of the preamble of claim 1, a display device having such a spectacle lens and a method for producing such a spectacle lens.

[0002] A spectacle lens of the type mentioned above is known from DE 10 2016 105 060 B3. Such spectacle lenses can be used, for example, in a display device that can be placed on the head of a user and generates an image, in order to provide so-called data glasses. Such data glasses are intended, for example, to have a sun protection function or to be designed as colored data glasses for fashion reasons. According to DE 10 2016 105 060 B3, this can be achieved by bonding a film to the base body using an adhesive layer, wherein the film has an absorbing, reflective or polarizing coating or a coloring to reduce transmission through the spectacle lens. The refractive index of the adhesive layer is lower than the refractive index of the base body, so that the light of the generated image is guided in the base body by total internal reflection.

[0003] Although the light of the imaging beam path or the generated image in the spectacle lens of the type mentioned above travels a significantly longer path through the base body than the incident ambient light or the incident sunlight, the desired sun protection function or the desired colored data glasses can be provided, since this is realized by the film glued to the base body.

[0004] A fully tinted material—as is common in standard sunglasses—would not be suitable for the lens type mentioned above, as the light rays creating the virtual image would be significantly reduced in brightness than the incoming sunlight. The same applies to many other design approaches in which the light creating the virtual image is guided through a light guide / waveguide.

[0005] However, this technical solution of DE 10 2016 105 060 B3 requires a film specifically colored in this color variant for each color variant.

[0006] Such films can be cost-effectively manufactured from colored granulate material, but this requires certain minimum quantities, making a differentiated color palette uneconomical. Combining differently colored films is conceivable, but this results in thicker glass, which is undesirable for aesthetic reasons. Alternatively, clear or pre-colored films can be recolored before or after they are applied to the base glass, but this is complex and difficult to reproduce.

[0007] Based on this, the object of the invention is to provide a spectacle lens of the type mentioned above that can be produced cost-effectively and has a desired sun protection function or a design as a colored spectacle lens that is desirable for fashion reasons. Furthermore, a display device with such a spectacle lens and a method for producing such a spectacle lens are to be provided.

[0008] The invention is defined in independent claims 1, 8 and 9. Advantageous further developments are specified in the dependent claims.

[0009] The spectacle lens according to the invention for a display device that can be placed on the head of a user and generates an image has a front side and a back side, an entrance section, a deflection section spaced from the entrance section, and a light guide channel that guides light beams of the generated image, which are coupled into the spectacle lens via the entrance section of the spectacle lens, through at least one reflection to the deflection section, from which they are deflected to exit the spectacle lens via the back side. The light guide channel comprises a base body and a first channel boundary layer, wherein the base body is made of a first material with a first refractive index (n 1) and comprises a first interface and a second interface, one of which faces away from the front side and the other of which faces away from the back side. The first channel boundary layer is applied directly to the first interface and is made of a second material having a second refractive index (n 2 ), where the second refractive index (n 2 ) is smaller than the first refractive index (n 1 ), so that reflections of the light beams at the boundary between the first channel boundary layer and the first interface are total reflections. The first channel boundary layer is formed as a colored layer.

[0010] Thus, by coloring the first channel boundary layer, the desired colored design of the spectacle lens and / or the desired sun protection function can be realized.

[0011] The colored channel boundary layer is preferably monochrome. A dye and / or pigments, for example, can be used as a colorant to form the first channel boundary layer as a colored layer. Thus, the first channel boundary layer is provided with a colorant.

[0012] Dyes are chemical compounds that have the property of coloring other materials and are soluble in their application medium (here, the first channel boundary layer). Pigments, on the other hand, are insoluble in their application medium (here, the first channel boundary layer).

[0013] At least one further layer can be applied to the first channel boundary layer. The at least one further layer can provide a polarization-dependent filter effect and can be formed as a colored layer and / or as a phototropic layer. The at least one further layer can be formed as a film.

[0014] The first channel boundary layer can be formed as a viscous or solid intermediate layer, as a viscous or solid layer and / or as an adhesive layer.

[0015] Coloring the first channel boundary layer is simple and can be customized for individual lenses. Coloring is particularly easy when the first channel boundary layer is designed as an adhesive layer.

[0016] In all cases mentioned, the term “colorant” also includes photochromic colorants.

[0017] In combination with, for example, a clear polarizing film as at least one additional layer, sunglasses with a polarizing effect can also be produced. If this polarizing film is pre-tinted, the color and intensity of the lens tint can be further varied by coloring the first channel boundary layer.

[0018] In the spectacle lens, a second channel boundary layer can be applied directly to the second interface and made of a third material with a third refractive index (n 3 ), where the third refractive index (n 3 ) is smaller than the first refractive index (n 1 ), so that reflections of the light beams at the boundary between the second channel boundary layer and the second interface are total reflections. The second channel boundary layer can be formed as a colored layer.

[0019] The second channel boundary layer provides a further degree of freedom for adjusting, for example, the color of the spectacle lens and / or the intensity of the tint of the spectacle lens. In particular, the second channel boundary layer can be developed in the same way as the first channel boundary layer. For example, the second channel boundary layer can be designed as a second adhesive layer, with which a further layer, a further film, or a corrective lens can be permanently bonded to the base body. The corrective lens can, for example, be a lens for correcting a user's vision impairment.

[0020] The base body can be made of glass or plastic. The same applies, for example, to the corrective lens and the described foils.

[0021] The spectacle lens can have an exit section on the rear side through which the deflected light beams exit the lens. Furthermore, the deflection section can deflect the light beams guided to it toward the exit section in such a way that they exit the lens through the exit section and are thus decoupled from the lens.

[0022] The deflection section and the exit section can be spatially separate sections. However, it is also possible for the deflection section and the exit section to coincide spatially, e.g., if the deflection section is designed as a surface grating.

[0023] Furthermore, a display device is provided with a holding device that can be placed on the head of a user (e.g., in the manner of glasses), an image generation module that is attached to the holding device and generates an image, and a spectacle lens according to the invention that is attached to the holding device. The generated image can be coupled into the spectacle lens via the entry section, guided in the spectacle lens by at least one total internal reflection to the deflection section, and decoupled from the spectacle lens via the exit section by deflection at the first deflection section such that the user can perceive it as a virtual image when the holding device is placed on the head.

[0024] Furthermore, a method for producing a spectacle lens according to the invention is provided, in which a base body made of a first material with a first refractive index (n 1) and has a first interface, a second interface and a deflection section, and a first channel boundary layer made of a second material having a second refractive index (n 2 ), which is smaller than the first refractive index (n 1 ), is applied (preferably directly) to the first interface, wherein the first channel boundary layer is formed as a colored layer.

[0025] In the manufacturing method, the first channel boundary layer may be a first adhesive layer with which a further layer is permanently bonded to the base body.

[0026] The first channel boundary layer is usually colored with a colorant before it is applied to the base body and / or to the (preformed) additional layer (e.g., cover film), and before the two parts are joined. A variant, however, is that the additional layer (e.g., cover film) remains on the channel boundary layer only during the curing process of the first channel boundary layer and is then removed again once the channel boundary layer has reached the desired strength. The additional layer (e.g., cover film) serves as a mold for applying the intermediate layer. Coloring can then also be done afterward.

[0027] Furthermore, it is possible that this mold for the first channel boundary layer is a permanent or reusable mold made of, for example, plastic, glass, ceramic and / or metal.

[0028] If the first channel boundary layer is applied using a wet-chemical process, economical production of small batch sizes is also possible. The colored material system that forms the first channel boundary layer can be applied using a spin-coating process or as a spray or dip coating. Coloring the wet-chemical layer after it has been applied to the base body and before applying the next layer (e.g., cover film) is also possible.

[0029] The low-refractive-index and colored first channel boundary layer applied in this way can have degrees of hardness typical for hard coatings used in the manufacture of plastic ophthalmic lenses, so that this first channel boundary layer can also assume the function of conventional hard coatings. In particular, the first channel boundary layer can be designed as a lacquer layer or a hard coating layer. The first channel boundary layer can thus form, for example, a finishing layer or the interface for anti-reflective coatings, mirror coatings, and / or clean coatings.

[0030] In the first spectacle lens, the deflecting section can have a single reflective deflecting element or several reflective deflecting elements arranged next to one another. With several reflective deflecting elements arranged next to one another, a desired deflecting function and, if appropriate, a certain imaging function of the deflecting section can be realized, for example, in a Fresnel-like manner (this can of course also be realized with a single reflective deflecting element). The reflective deflecting elements can be reflective surface pieces, which can also be referred to as reflective facets. The reflective surface pieces can each be flat. However, it is also possible for the reflective surface pieces themselves to be curved (for example, spherically or aspherically curved or free-form).In the same way, the single reflective deflecting element can be flat or curved (for example, spherically or aspherically curved or free-form).

[0031] The reflectivity of the respective reflective deflection elements (or of the single reflective deflection element) can, for example, be in the range of 2 - 100% (including the range limits). Thus, the reflective deflection elements can be partially reflective or reflective.

[0032] The first spectacle lens may, in particular, have a curved rear side and / or a curved front side. The entrance portion may be formed in the rear side.

[0033] The light beams of the corresponding imaging unit are preferably guided to the deflection section by one or more reflections (in particular total internal reflections).

[0034] The image generation module can generate a monochrome image or a multi-color image.

[0035] The display device may include a control unit that controls the image generation module. In particular, the control unit may control the image generation module based on supplied image data.

[0036] The image generation module or the corresponding image generator unit can, in particular, comprise a planar image generator, such as an LCD module, an LCoS module, an OLED module, a µLED, or a tilting mirror array. Each image generator can comprise a plurality of pixels, which can be arranged, for example, in rows and columns. Each image generator can, for example, be self-luminous or non-self-luminous.

[0037] Each imager can preferably produce a monochromatic image, with different imagers producing monochromatic images at different wavelengths.

[0038] The imaging module may, for example, comprise a polychromatic imager, a combination of two or more monochromatic imagers, or a combination of a duochromatic imager and a monochromatic imager. Typical configurations of such imaging modules with multiple imagers comprise an overlay unit that overlays the light beams of the multiple imagers into a common light beam. Such an overlay unit may, for example, be implemented as a beam splitter cube (also called an X-cube) or as a so-called rod combiner, which are known to those skilled in the art.

[0039] Since the outcoupling deflection section should be as invisible as possible and also interfere with the light arriving from the surroundings to the viewer's eye as little as possible, deflection sections are generally preferred that have high transmission in the transparent state and thus low reflectivity for the light beam(s) to be coupled out of the at least two-color image. Typical values ​​for the ratio of reflection to transmission are 50%, 30%, 10%, or 2%, uniformly across the visible wavelength range.

[0040] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

[0041] The invention is explained in more detail below using exemplary embodiments with reference to the attached drawings, which also disclose features essential to the invention. These exemplary embodiments are merely illustrative and are not to be interpreted as restrictive. For example, a description of an embodiment with a large number of elements or components should not be interpreted as meaning that all of these elements or components are necessary for implementation. Rather, other embodiments may also contain alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different embodiments may be combined with one another unless otherwise stated. Modifications and variations described for one of the exemplary embodiments may also be applicable to other embodiments.To avoid repetition, identical or corresponding elements in different figures are designated by the same reference numerals and are not explained more than once. The figures show: Fig. 1 is a schematic perspective view of an embodiment of the display device according to the invention; Fig. 2 an enlarged partial sectional view of the first spectacle lens including a schematic representation of the first image generation module according to another embodiment; Fig. 3 is an enlarged partial sectional view of the first spectacle lens including a schematic representation of the first image generation module according to another embodiment; Fig. 4 an enlarged partial sectional view of the first spectacle lens including a schematic representation of the first image generation module according to a further embodiment, and Fig. 5 an enlarged partial sectional view of the first spectacle lens including a schematic representation of the first image generation module according to another embodiment.

[0042] At the Fig. In the embodiment shown in Figure 1, the display device 1 according to the invention comprises a holding device 2 which can be placed on the head of a user and which can be designed, for example, in the manner of a conventional spectacle frame, as well as a first and a second spectacle lens 3, 4 which are fastened to the holding device 2. The first spectacle lens 3 and / or the second spectacle lens 4 can be designed individually as spectacle lenses according to the invention or as spectacle lenses according to the invention. The holding device 2 with the spectacle lenses 3, 4 can be designed, for example, as sports glasses, sunglasses, and / or glasses for correcting ametropia, wherein a virtual image can be projected into the user's field of vision via the first spectacle lens 3, which can also be referred to as a multifunctional lens, as described below.

[0043] For this purpose, the display device 1 comprises a first image generation module 5, which can be arranged in the area of ​​the right temple of the holding device 2, as shown in Fig. 1 is shown schematically.

[0044] The first image generation module 5 may comprise a first image generator unit 7 for generating a first image, as shown in Fig. 2 is shown schematically. For this purpose, the first imaging unit 7 comprises a first planar imaging element 8, which is followed by a first imaging optics 9. The first planar imaging element 8 can have, for example, an OLED element, an LCD element, an LCoS element, a µLED or a tilting mirror matrix, each of which comprises a plurality of pixels arranged, for example, in rows and columns. A single light beam L1 is shown schematically as a representative of the light beams emitted by the first planar imaging element 8.

[0045] How Fig. 2, a control unit 10 is provided, for example with a processor P and a memory M for controlling the first image generation module 5. The control unit 10, which can be arranged, for example, on the holding device 2, controls the first image generation module 5 and in particular the first image generation element 8 as a function of supplied image data such that a first image is generated in accordance with the image data. The light beams L1 emitted by the first image generation element 8 pass through the first imaging optics 9 and then enter the first spectacle lens 3 via a curved rear side 11 of the latter. The region of the entrance on the rear side 11 can also be referred to as the entrance section 12.

[0046] The first spectacle lens 3 comprises a base body 13 with a first and a second interface 14, 15, a first adhesive layer 16 formed on the first interface 14, and a film 17 with a polarization effect applied to the first adhesive layer 16, wherein the film 17 is connected to the base body 13 by means of the first adhesive layer 16. In the exemplary embodiment described here, the two interfaces 14, 15 of the base body 13 are curved, and the second interface 15 of the base body 13 forms the rear side 11 of the first spectacle lens 3.

[0047] Furthermore, the base body 13 has a buried first deflection section 18, which comprises a first reflective deflection structure 19 with a plurality of first reflective deflection elements 20, which can also be referred to as first reflective facets.

[0048] As already described, the light beams L1 enter the first spectacle lens 3 and thus the base body 13 via the entrance section 12 in the rear side 11. The light beams L1 are then guided in the base body 13 by total internal reflection at the first and second boundary surfaces 14, 15 to the first deflection section 18, so that a first light guide channel 21 is present from the entrance section 12 to the first deflection section 18. The first deflection section 18 then deflects the light beams L1 toward the rear side 11 such that the deflected light beams L1 exit the first spectacle lens 3 via the rear side 11. The area through which the light beams L1 exit can also be referred to as the exit section 22.

[0049] In order for the desired total internal reflection to occur at the first interface 14, the base body 13 is provided with a first refractive index n 1and the first adhesive layer 16 with a second refractive index n 2 provided so that the second refractive index n 2 is smaller than the first refractive index n 1 .

[0050] In particular, the angles of incidence θ E the light beam L1 relative to the surface normal F (in Fig. 2 for the first reflection at the first interface 14 (shown as a dashed line) of a surface element at which the total reflection is to take place, is greater than the critical angle θ G for the occurrence of total internal reflection. The critical angle is determined by the ratio of the first refractive index n 1 , i.e. the refractive index of the material of the base body 13, to the second refractive index n 2 , i.e. the refractive index of the material of the adhesive layer 16, and can be calculated from the equation θ G = arcsin(n 2 / n 1). For a given design of the base body 13 and the first image generation module 5, the angles of incidence θ E of the light beam L1 onto the first interface 14. In order for total reflection to occur, the materials of the base body 13 and the first adhesive layer 16 are selected so that at the first interface 14 the inequality n 2 < n 1 * sin(θ E ) is satisfied. Since sin(θ E ) is always less than or equal to 1, the second refractive index n 2 i.e. smaller than the first refractive index n 1 Since the second interface 15 forms the back side 11 of the first spectacle lens 3, there is an interface to air and thus to a medium with a refractive index of 1. The design of the base body 13 and the first image generation module 5 is selected such that total internal reflection also occurs at the second interface.

[0051] The first adhesive layer 16 thus delimits the light-guiding channel 21 and can therefore also be referred to as the first channel boundary layer 16. Furthermore, the first adhesive layer 16 serves to bond the film 17 with a polarization effect to the base body 13, so that the polarization-dependent filtering effect of the film 17 provides a desired sunglasses effect. The film 17 is preferably transparent. The side of the film 17 facing away from the base body 13 forms a front side 23 of the first spectacle lens 3.

[0052] In order to be able to realize a colored first spectacle lens 3, for example, desired for fashion reasons, the first adhesive layer 16 is designed as a colored layer. For this purpose, the first adhesive layer 16 can be colored. Since layer 16 is an adhesive layer, this is quite simple and can be implemented individually for each spectacle lens.

[0053] The first adhesive layer 16 may in particular be a viscous or solid intermediate layer.

[0054] The first adhesive layer 16 is usually colored with a colorant before being applied to the base body 13 and / or to the (preformed) cover film 17 and before the two parts are joined together. However, a variant also consists in the cover film 17 remaining on the base body 13 only during the curing process and then being removed again after the first adhesive layer 16 has reached the desired strength. A first spectacle lens formed according to this alternative is shown in Fig. 3 shown.

[0055] The film 17 serves as a mold for applying the intermediate layer. Instead of the film 17, this mold can be a permanent or reusable mold made of, for example, plastic, glass, ceramic, and / or metal. Coloring can then also be performed subsequently.

[0056] If the first adhesive layer 16 is applied using a wet-chemical process, economical production of small batch sizes is easily feasible. The colored material system forming the first adhesive layer 16 can be applied using a spin-coating process or as a spray or dip coating. Coloring the wet-chemical layer after its application to the base body 13 and before applying a cover film 17 is also possible.

[0057] The first adhesive layer 16 applied in this way can achieve degrees of hardness typical for hard coatings used in the manufacture of plastic ophthalmic lenses, so that the first adhesive layer 16 also assumes the function of conventional hard coatings. In this case, the first adhesive layer 16 becomes the final layer or interface for anti-reflective coatings, mirror coatings, and / or clean coatings.

[0058] In Fig. 4 is a modification of the first spectacle lens 3 according to Fig. 2. In this modification, a second adhesive layer 24 is applied to the second interface 15 of the base body 13, which adhesive layer connects a corrective lens 25 to the base body 13. The side of the corrective lens 25 facing away from the second adhesive layer 24 then forms the back side 11 of the first spectacle lens 3. The corrective lens 25 serves to correct a user's visual impairment and can, for example, be customized to the user.

[0059] The second adhesive layer 24 can be formed in the same way as the first adhesive layer 16. In particular, the third refractive index n 3 the second adhesive layer 24 is smaller than the first refractive index n 1 so that the light beams are guided at the second interface 15 by total internal reflection.

[0060] The first image generation module 5 and the first spectacle lens 3 are designed such that a user wearing the display device 1 according to the invention on his head can perceive the first image generated by means of the first image generation module 5 as a first virtual image with his first eye (here the right eye).

[0061] The first imaging unit 7 may be configured to generate and output a monochromatic (and thus single-color) image. However, it may also be configured to generate and output a multicolor image.

[0062] Furthermore, it is possible to use several imaging units 7, 7' and 7" ( Fig. 5) which generate and emit, for example, a red, green and blue partial image, which is then superimposed by means of a superposition unit 35 (for example a color donor cube) to form a common beam L1, as for the first image generation module 5 in Fig. 5 is shown.

[0063] Depending on the reflectivity of the first deflecting elements 20, the first virtual image can be perceived by the user in superimposition with the surroundings. With very high reflectivity, and in particular with a reflectivity of 100%, the user can only perceive the first virtual image and not the surroundings, at least in the area of ​​the first deflecting section 18, if a certain distance between the first deflecting elements 20 is not exceeded. If the certain distance between adjacent deflecting elements 20 is exceeded, ambient light can reach the eye unhindered between them, so that even with 100% reflectivity of the deflecting elements 20, a view of the surroundings is possible, resulting in a quasi-perforated / segmented 100% mirror.

[0064] In the display device 1 according to the invention, the virtual image is projected into the user's field of vision via the first spectacle lens 3. Of course, it is also possible to project it via the second spectacle lens 4. Furthermore, the display device 1 can be configured such that information or virtual images are projected via both spectacle lenses 3, 4. The projecting can be configured to create a three-dimensional image impression. However, this is not absolutely necessary.

[0065] The spectacle lenses 3, 4 can have a refractive power of zero or a refractive power other than zero (in particular for correcting a visual impairment). In particular, both the front side 23 and the rear side 11 can be curved. The front side 23 is in particular spherically curved. If the spectacle lens 3, 4 has a refractive power other than zero in order to correct a visual impairment, the curvature of the rear side 11 is generally selected accordingly to achieve the corresponding correction. The rear side 11 can have a curvature that deviates from the spherical shape.

[0066] The holding device 2 does not have to be designed as a glasses-like holding device. Any other type of holding device is also possible, allowing the display device 1 to be placed and worn on the head. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2016 105 060 B3 [0002, 0005]

Claims

[1] Spectacle lens for a display device (1) which can be placed on the head of a user and generates an image, wherein the spectacle lens (3) has a front side (23) and a back side (11), an inlet section (12) and a deflection section (18) spaced from the inlet section (12), and a light guide channel (21) which guides light beams (L1) of the generated image, which are coupled into the spectacle lens (3) via the entrance section (12) of the spectacle lens (3), in the spectacle lens (3) through at least one reflection to the deflection section (18), from which they are deflected to exit the spectacle lens (3) via the rear side (11), wherein the light guide channel (21) has a base body (13) and a first channel boundary layer (16), wherein the base body (13) is made of a first material with a first refractive index (n 1) and comprises a first interface (14) and a second interface (15), one of which faces away from the front side (23) and the other away from the back side (11), wherein the first channel boundary layer (16) is applied directly to the first interface (14) and is made of a second material having a second refractive index (n 2 ) is formed, where the second refractive index (n 2 ) is smaller than the first refractive index (n 1 ), so that reflections of the light beams (L1) at the boundary between the first channel boundary layer (16) and the first interface (14) are total reflections, characterized by , that the first channel boundary layer (16) is formed as a colored layer. [2] Spectacle lens according to claim 1, wherein at least one further layer is applied to the first channel boundary layer (16). [3] Spectacle lens according to claim 2, wherein the at least one further layer (17) provides a polarization-dependent filter effect, is designed as a colored layer (17) and / or as a phototropic layer. [4] Spectacle lens according to claim 2 or 3, wherein the at least one further layer (17) is formed as a film. [5] Spectacle lens according to claim 1 or 2, wherein the first channel boundary layer (16) is formed as a viscous or solid layer. [6] Spectacle lens according to one of the above claims, wherein the first channel boundary layer (16) is formed as an adhesive layer. [7] Spectacle lens according to one of the above claims, wherein a second channel boundary layer (24) is applied directly to the second interface (15) and is made of a third material having a third refractive index (n 3 ) is formed, where the third refractive index (n 3 ) is smaller than the first refractive index (n 1), so that reflections of the light beams (L1) at the boundary between the second channel boundary layer (24) and the second interface (15) are total reflections, and wherein the second channel boundary layer (24) is formed as a colored layer. [8] Display device with a holding device (2) that can be placed on the head of a user, an image generation module (5) attached to the holding device (2) which generates an image, a spectacle lens (3) fastened to the holding device (2) according to one of the above claims, wherein the generated image is coupled into the spectacle lens (3) via the entry section (12), guided in the spectacle lens (3) by at least one reflection to the deflection section (18) and deflected at the first deflection section (18) in order to exit from the spectacle lens (3) via the rear side, so that the user can perceive it as a virtual image when the holding device (2) is placed on the head. [9] A method for producing a spectacle lens according to any one of claims 1 to 7, in which a base body (13) made of a first material with a first refractive index (n 1 ) and has a first interface (14), a second interface (15) and a deflection section (18), a first channel boundary layer (16) made of a second material having a second refractive index (n 2 ), which is smaller than the first refractive index (n 1 ) is formed, is applied to the first interface, wherein the first channel boundary layer is formed as a colored layer. [10] Method according to claim 9, wherein a further layer (17) is applied to the first channel boundary layer (16), which further layer is connected to the base body (13) by means of the first channel boundary layer (16). [11] Method according to claim 9 or 10, wherein the first channel boundary layer (16) is applied directly to the first interface.

Images